Personalized to your biology
Your skin type changes everything.
A Type I person produces vitamin D up to 6x faster than a Type VI. Generic sun advice ignores this entirely. SunVitD does not.
Fitzpatrick Scale - developed at Harvard Medical School, 1975. Used by dermatologists worldwide.
The problem
1 billion people are vitamin D deficient.
Most do not know it.
The official RDA is 600 IU/day. But peer-reviewed research shows the real number is closer to 8,895 IU/day — a statistical error that has gone uncorrected for decades. You cannot fix what you cannot measure.
Bone and muscle weakness
Low vitamin D is directly linked to osteoporosis, muscle pain, and chronic fatigue — symptoms often dismissed as "normal aging".
Mood and cognitive decline
Vitamin D receptors exist throughout the brain. Deficiency is associated with depression, brain fog, and increased dementia risk.
Immune dysfunction
Vitamin D is a critical immune regulator. Deficiency correlates with higher rates of infections, autoimmune conditions, and cancer.
You live too far north
Above 35° latitude, your skin produces almost no vitamin D for 4-6 months of the year. Most of Europe and North America qualifies.
How it works
Your personal sun intelligence.
In 3 steps.
We read your environment
SunVitD pulls live UV index and air quality data for your exact GPS location. No guessing — real conditions, right now.
You set your skin type
Using the Fitzpatrick scale, we calibrate vitamin D production to your biology. Darker skin needs more sun — we account for that precisely.
We calculate your vitamin D
Our algorithm estimates exactly how much vitamin D you produced, how long until burn risk, and how far you are from your optimal daily target.
Features
Everything you need.
Nothing you do not.
Live UV Index
Real-time UV data from your GPS location
Air Quality
AQI tracking — pollution reduces vitamin D synthesis
Skin Type Calibration
Fitzpatrick scale personalizes every calculation
Exposure History
Track your vitamin D over days, weeks, months
Burn Risk Timer
Know exactly when to get out of the sun
Daily Sun Report
Morning email with your UV forecast and goals
Lost Opportunities
See the vitamin D you missed on cloudy days
Science-based Goals
8,895 IU/day target — not the outdated 600 IU RDA
The science
We took the research seriously.
So you do not have to.
In 2014, Veugelers & Ekwaru identified a critical statistical error in the IOM's vitamin D RDA calculation. When corrected, the data shows adults need approximately 8,895 IU/day — not 600 IU. SunVitD is built around this correction.
For informational purposes only. Not medical advice. Consult your doctor before changing supplementation.
Pricing
Less than a vitamin D supplement.
Way more useful.
Start free. Upgrade when you are ready.
- ✓ Live UV + AQI readings
- ✓ Vitamin D calculator (3 uses)
- ✓ 7-day history
- ✓ Skin type calibration
- ✓ Everything in Free
- ✓ Full exposure history
- ✓ UV + AQI charts
- ✓ Missed opportunity tracking
- ✓ Daily sun report email
- ✓ Advanced analytics
- ✓ CSV & PDF export
The sun rises tomorrow.
Will you track it?
Join people who stopped guessing and started knowing. Free to start. Takes 30 seconds.
Start Tracking Free